Try Postgres 17 on Windows

.github/workflows/simple.yml

@@ -15,7 +15,8 @@ jobs:
       matrix:
         os: [macos-latest, windows-latest]
         # Older GHCs need LLVM on macos-latest (ARM)
-        ghc: ['9.2','9.4.8','9.6.6','9.8.2','9.10.1']
+        ghc: ['9.10.2']
+        psql: ['16', '17']
       fail-fast: false
     timeout-minutes:
       60
@@ -33,17 +34,34 @@ jobs:
           cabal-version: '3.10.2.0'
 
       - name: Set up PostgreSQL
-        uses: ikalnytskyi/action-setup-postgres@v6
+        uses: ikalnytskyi/action-setup-postgres@v7
         id: postgres
         with:
           username: ci
           password: sw0rdfish
           database: test
-          postgres-version: "14"
+          postgres-version: ${{ matrix.psql }}
 
+      - name: Debug
+        shell: bash
+        run: |
+          ls c:/progra~1/postgr~1/ || true
+          ls c:/progra~1/postgr~1/16 || true
+          ls c:/progra~1/postgr~1/17 || true
+          ls c:/progra~1/postgr~1/16/lib || true
+          ls c:/progra~1/postgr~1/17/lib || true
+
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: More debug
+        run:
+          gcc -o smalltest -IC:/PROGRA~1/POSTGR~1/${{ matrix.psql }}/include  -LC:/PROGRA~1/POSTGR~1/${{ matrix.psql }}/lib small.c  -lpq
+
+      - name: More debug
+        run:
+          C:\ghcup\ghc\910~1.2\lib/../mingw//bin\clang.exe -o smalltest -IC:/PROGRA~1/POSTGR~1/${{ matrix.psql }}/include  -LC:/PROGRA~1/POSTGR~1/${{ matrix.psql }}/lib small.c  -lpq
+
       - name: Cache
         uses: actions/cache@v4
         with:

postgresql-libpq-configure/configure

@@ -1535,6 +1535,9 @@ case "(($ac_try" in
 esac
 eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
 printf "%s\n" "$ac_try_echo"; } >&5
+  echo "$ac_link"
+  echo "$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS"
+  (eval "$ac_link") || true
   (eval "$ac_link") 2>conftest.err
   ac_status=$?
   if test -s conftest.err; then
@@ -3987,6 +3990,8 @@ then :
   break
 fi
 
+    $PG_CONFIG
+
 	  found_postgresql="yes"
 	  break
 	done

postgresql-libpq-configure/m4/ax_lib_postgresql.m4

@@ -98,6 +98,8 @@ AC_DEFUN([_AX_LIB_POSTGRESQL_OLD],[
 	  ])
 	  AS_IF([test "X$found_postgresql_req_version" = "Xno"],[break])
 
+    $PG_CONFIG
+
 	  found_postgresql="yes"
 	  break
 	done

small.c

@@ -0,0 +1,7 @@
+#include <libpq-fe.h>
+
+int main() {
+		    char conninfo[]="dbname = postgres";
+		    PGconn     *conn;
+		    conn = PQconnectdb(conninfo);
+}